Checks whether a value is a number, and returns TRUE or FALSE.
| Name | Type | Description |
| arg1 | any | Is the value you want to test. Value can refer to a cell, a formula, or a name that refers to a cell, formula, or value. |
builder.CreateFile("xlsx");
var oWorksheet = Api.GetActiveSheet();
var oFunction = Api.GetWorksheetFunction();
oWorksheet.GetRange("A1").SetValue(oFunction.ISNUMBER("#N/A"));
oWorksheet.GetRange("A2").SetValue(oFunction.ISNUMBER(255));
oWorksheet.GetRange("A3").SetValue(oFunction.ISNUMBER("Online Office"));
builder.SaveFile("xlsx", "ISNUMBER.xlsx");
builder.CloseFile();